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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Inventories
Finished goods	$ 294,214	$ 323,315
Raw materials and precious metals	194,648	157,931
In-process inventories	61,862	115,372
Parts and supplies	39,383	39,603
Inventories	$ 590,107	$ 636,221

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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